drivers/net/wireless/ath/regd.c

   1 /*
   2  * Copyright (c) 2008-2009 Atheros Communications Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  18
  19 #include <linux/kernel.h>
  20 #include <linux/export.h>
  21 #include <net/cfg80211.h>
  22 #include <net/mac80211.h>
  23 #include "regd.h"
  24 #include "regd_common.h"
  25
  26 static int __ath_regd_init(struct ath_regulatory *reg);
  27
  28 /*
  29  * This is a set of common rules used by our world regulatory domains.
  30  * We have 12 world regulatory domains. To save space we consolidate
  31  * the regulatory domains in 5 structures by frequency and change
  32  * the flags on our reg_notifier() on a case by case basis.
  33  */
  34
  35 /* Only these channels all allow active scan on all world regulatory domains */
  36 #define ATH9K_2GHZ_CH01_11      REG_RULE(2412-10, 2462+10, 40, 0, 20, 0)
  37
  38 /* We enable active scan on these a case by case basis by regulatory domain */
  39 #define ATH9K_2GHZ_CH12_13      REG_RULE(2467-10, 2472+10, 40, 0, 20,\
  40                                          NL80211_RRF_NO_IR)
  41 #define ATH9K_2GHZ_CH14         REG_RULE(2484-10, 2484+10, 40, 0, 20,\
  42                                          NL80211_RRF_NO_IR | \
  43                                          NL80211_RRF_NO_OFDM)
  44
  45 /* We allow IBSS on these on a case by case basis by regulatory domain */
  46 #define ATH9K_5GHZ_5150_5350    REG_RULE(5150-10, 5350+10, 80, 0, 30,\
  47                                          NL80211_RRF_NO_IR)
  48 #define ATH9K_5GHZ_5470_5850    REG_RULE(5470-10, 5850+10, 80, 0, 30,\
  49                                          NL80211_RRF_NO_IR)
  50 #define ATH9K_5GHZ_5725_5850    REG_RULE(5725-10, 5850+10, 80, 0, 30,\
  51                                          NL80211_RRF_NO_IR)
  52
  53 #define ATH9K_2GHZ_ALL          ATH9K_2GHZ_CH01_11, \
  54                                 ATH9K_2GHZ_CH12_13, \
  55                                 ATH9K_2GHZ_CH14
  56
  57 #define ATH9K_5GHZ_ALL          ATH9K_5GHZ_5150_5350, \
  58                                 ATH9K_5GHZ_5470_5850
  59
  60 /* This one skips what we call "mid band" */
  61 #define ATH9K_5GHZ_NO_MIDBAND   ATH9K_5GHZ_5150_5350, \
  62                                 ATH9K_5GHZ_5725_5850
  63
  64 /* Can be used for:
  65  * 0x60, 0x61, 0x62 */
  66 static const struct ieee80211_regdomain ath_world_regdom_60_61_62 = {
  67         .n_reg_rules = 5,
  68         .alpha2 =  "99",
  69         .reg_rules = {
  70                 ATH9K_2GHZ_ALL,
  71                 ATH9K_5GHZ_ALL,
  72         }
  73 };
  74
  75 /* Can be used by 0x63 and 0x65 */
  76 static const struct ieee80211_regdomain ath_world_regdom_63_65 = {
  77         .n_reg_rules = 4,
  78         .alpha2 =  "99",
  79         .reg_rules = {
  80                 ATH9K_2GHZ_CH01_11,
  81                 ATH9K_2GHZ_CH12_13,
  82                 ATH9K_5GHZ_NO_MIDBAND,
  83         }
  84 };
  85
  86 /* Can be used by 0x64 only */
  87 static const struct ieee80211_regdomain ath_world_regdom_64 = {
  88         .n_reg_rules = 3,
  89         .alpha2 =  "99",
  90         .reg_rules = {
  91                 ATH9K_2GHZ_CH01_11,
  92                 ATH9K_5GHZ_NO_MIDBAND,
  93         }
  94 };
  95
  96 /* Can be used by 0x66 and 0x69 */
  97 static const struct ieee80211_regdomain ath_world_regdom_66_69 = {
  98         .n_reg_rules = 3,
  99         .alpha2 =  "99",
 100         .reg_rules = {
 101                 ATH9K_2GHZ_CH01_11,
 102                 ATH9K_5GHZ_ALL,
 103         }
 104 };
 105
 106 /* Can be used by 0x67, 0x68, 0x6A and 0x6C */
 107 static const struct ieee80211_regdomain ath_world_regdom_67_68_6A_6C = {
 108         .n_reg_rules = 4,
 109         .alpha2 =  "99",
 110         .reg_rules = {
 111                 ATH9K_2GHZ_CH01_11,
 112                 ATH9K_2GHZ_CH12_13,
 113                 ATH9K_5GHZ_ALL,
 114         }
 115 };
 116
 117 static bool dynamic_country_user_possible(struct ath_regulatory *reg)
 118 {
 119         if (config_enabled(CONFIG_ATH_REG_DYNAMIC_USER_CERT_TESTING))
 120                 return true;
 121
 122         switch (reg->country_code) {
 123         case CTRY_UNITED_STATES:
 124         case CTRY_JAPAN1:
 125         case CTRY_JAPAN2:
 126         case CTRY_JAPAN3:
 127         case CTRY_JAPAN4:
 128         case CTRY_JAPAN5:
 129         case CTRY_JAPAN6:
 130         case CTRY_JAPAN7:
 131         case CTRY_JAPAN8:
 132         case CTRY_JAPAN9:
 133         case CTRY_JAPAN10:
 134         case CTRY_JAPAN11:
 135         case CTRY_JAPAN12:
 136         case CTRY_JAPAN13:
 137         case CTRY_JAPAN14:
 138         case CTRY_JAPAN15:
 139         case CTRY_JAPAN16:
 140         case CTRY_JAPAN17:
 141         case CTRY_JAPAN18:
 142         case CTRY_JAPAN19:
 143         case CTRY_JAPAN20:
 144         case CTRY_JAPAN21:
 145         case CTRY_JAPAN22:
 146         case CTRY_JAPAN23:
 147         case CTRY_JAPAN24:
 148         case CTRY_JAPAN25:
 149         case CTRY_JAPAN26:
 150         case CTRY_JAPAN27:
 151         case CTRY_JAPAN28:
 152         case CTRY_JAPAN29:
 153         case CTRY_JAPAN30:
 154         case CTRY_JAPAN31:
 155         case CTRY_JAPAN32:
 156         case CTRY_JAPAN33:
 157         case CTRY_JAPAN34:
 158         case CTRY_JAPAN35:
 159         case CTRY_JAPAN36:
 160         case CTRY_JAPAN37:
 161         case CTRY_JAPAN38:
 162         case CTRY_JAPAN39:
 163         case CTRY_JAPAN40:
 164         case CTRY_JAPAN41:
 165         case CTRY_JAPAN42:
 166         case CTRY_JAPAN43:
 167         case CTRY_JAPAN44:
 168         case CTRY_JAPAN45:
 169         case CTRY_JAPAN46:
 170         case CTRY_JAPAN47:
 171         case CTRY_JAPAN48:
 172         case CTRY_JAPAN49:
 173         case CTRY_JAPAN50:
 174         case CTRY_JAPAN51:
 175         case CTRY_JAPAN52:
 176         case CTRY_JAPAN53:
 177         case CTRY_JAPAN54:
 178         case CTRY_JAPAN55:
 179         case CTRY_JAPAN56:
 180         case CTRY_JAPAN57:
 181         case CTRY_JAPAN58:
 182         case CTRY_JAPAN59:
 183                 return false;
 184         }
 185
 186         return true;
 187 }
 188
 189 static bool ath_reg_dyn_country_user_allow(struct ath_regulatory *reg)
 190 {
 191         if (!config_enabled(CONFIG_ATH_REG_DYNAMIC_USER_REG_HINTS))
 192                 return false;
 193         if (!dynamic_country_user_possible(reg))
 194                 return false;
 195         return true;
 196 }
 197
 198 static inline bool is_wwr_sku(u16 regd)
 199 {
 200         return ((regd & COUNTRY_ERD_FLAG) != COUNTRY_ERD_FLAG) &&
 201                 (((regd & WORLD_SKU_MASK) == WORLD_SKU_PREFIX) ||
 202                 (regd == WORLD));
 203 }
 204
 205 static u16 ath_regd_get_eepromRD(struct ath_regulatory *reg)
 206 {
 207         return reg->current_rd & ~WORLDWIDE_ROAMING_FLAG;
 208 }
 209
 210 bool ath_is_world_regd(struct ath_regulatory *reg)
 211 {
 212         return is_wwr_sku(ath_regd_get_eepromRD(reg));
 213 }
 214 EXPORT_SYMBOL(ath_is_world_regd);
 215
 216 static const struct ieee80211_regdomain *ath_default_world_regdomain(void)
 217 {
 218         /* this is the most restrictive */
 219         return &ath_world_regdom_64;
 220 }
 221
 222 static const struct
 223 ieee80211_regdomain *ath_world_regdomain(struct ath_regulatory *reg)
 224 {
 225         switch (reg->regpair->regDmnEnum) {
 226         case 0x60:
 227         case 0x61:
 228         case 0x62:
 229                 return &ath_world_regdom_60_61_62;
 230         case 0x63:
 231         case 0x65:
 232                 return &ath_world_regdom_63_65;
 233         case 0x64:
 234                 return &ath_world_regdom_64;
 235         case 0x66:
 236         case 0x69:
 237                 return &ath_world_regdom_66_69;
 238         case 0x67:
 239         case 0x68:
 240         case 0x6A:
 241         case 0x6C:
 242                 return &ath_world_regdom_67_68_6A_6C;
 243         default:
 244                 WARN_ON(1);
 245                 return ath_default_world_regdomain();
 246         }
 247 }
 248
 249 bool ath_is_49ghz_allowed(u16 regdomain)
 250 {
 251         /* possibly more */
 252         return regdomain == MKK9_MKKC;
 253 }
 254 EXPORT_SYMBOL(ath_is_49ghz_allowed);
 255
 256 /* Frequency is one where radar detection is required */
 257 static bool ath_is_radar_freq(u16 center_freq)
 258 {
 259         return (center_freq >= 5260 && center_freq <= 5700);
 260 }
 261
 262 static void ath_force_clear_no_ir_chan(struct wiphy *wiphy,
 263                                        struct ieee80211_channel *ch)
 264 {
 265         const struct ieee80211_reg_rule *reg_rule;
 266
 267         reg_rule = freq_reg_info(wiphy, MHZ_TO_KHZ(ch->center_freq));
 268         if (IS_ERR(reg_rule))
 269                 return;
 270
 271         if (!(reg_rule->flags & NL80211_RRF_NO_IR))
 272                 if (ch->flags & IEEE80211_CHAN_NO_IR)
 273                         ch->flags &= ~IEEE80211_CHAN_NO_IR;
 274 }
 275
 276 static void ath_force_clear_no_ir_freq(struct wiphy *wiphy, u16 center_freq)
 277 {
 278         struct ieee80211_channel *ch;
 279
 280         ch = ieee80211_get_channel(wiphy, center_freq);
 281         if (!ch)
 282                 return;
 283
 284         ath_force_clear_no_ir_chan(wiphy, ch);
 285 }
 286
 287 static void ath_force_no_ir_chan(struct ieee80211_channel *ch)
 288 {
 289         ch->flags |= IEEE80211_CHAN_NO_IR;
 290 }
 291
 292 static void ath_force_no_ir_freq(struct wiphy *wiphy, u16 center_freq)
 293 {
 294         struct ieee80211_channel *ch;
 295
 296         ch = ieee80211_get_channel(wiphy, center_freq);
 297         if (!ch)
 298                 return;
 299
 300         ath_force_no_ir_chan(ch);
 301 }
 302
 303 static void
 304 __ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
 305                                 struct ath_regulatory *reg,
 306                                 enum nl80211_reg_initiator initiator,
 307                                 struct ieee80211_channel *ch)
 308 {
 309         if (ath_is_radar_freq(ch->center_freq) ||
 310             (ch->flags & IEEE80211_CHAN_RADAR))
 311                 return;
 312
 313         switch (initiator) {
 314         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 315                 ath_force_clear_no_ir_chan(wiphy, ch);
 316                 break;
 317         case NL80211_REGDOM_SET_BY_USER:
 318                 if (ath_reg_dyn_country_user_allow(reg))
 319                         ath_force_clear_no_ir_chan(wiphy, ch);
 320                 break;
 321         default:
 322                 if (ch->beacon_found)
 323                         ch->flags &= ~IEEE80211_CHAN_NO_IR;
 324         }
 325 }
 326
 327 /*
 328  * These exception rules do not apply radar frequencies.
 329  *
 330  * - We enable initiating radiation if the country IE says its fine:
 331  * - If no country IE has been processed and a we determine we have
 332  *   received a beacon on a channel we can enable initiating radiation.
 333  */
 334 static void
 335 ath_reg_apply_beaconing_flags(struct wiphy *wiphy,
 336                               struct ath_regulatory *reg,
 337                               enum nl80211_reg_initiator initiator)
 338 {
 339         enum ieee80211_band band;
 340         struct ieee80211_supported_band *sband;
 341         struct ieee80211_channel *ch;
 342         unsigned int i;
 343
 344         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 345                 if (!wiphy->bands[band])
 346                         continue;
 347                 sband = wiphy->bands[band];
 348                 for (i = 0; i < sband->n_channels; i++) {
 349                         ch = &sband->channels[i];
 350                         __ath_reg_apply_beaconing_flags(wiphy, reg,
 351                                                         initiator, ch);
 352                 }
 353         }
 354 }
 355
 356 /**
 357  * ath_reg_apply_ir_flags()
 358  * @wiphy: the wiphy to use
 359  * @initiator: the regulatory hint initiator
 360  *
 361  * If no country IE has been received always enable passive scan
 362  * and no-ibss on these channels. This is only done for specific
 363  * regulatory SKUs.
 364  *
 365  * If a country IE has been received check its rule for this
 366  * channel first before enabling active scan. The passive scan
 367  * would have been enforced by the initial processing of our
 368  * custom regulatory domain.
 369  */
 370 static void
 371 ath_reg_apply_ir_flags(struct wiphy *wiphy,
 372                        struct ath_regulatory *reg,
 373                        enum nl80211_reg_initiator initiator)
 374 {
 375         struct ieee80211_supported_band *sband;
 376
 377         sband = wiphy->bands[IEEE80211_BAND_2GHZ];
 378         if (!sband)
 379                 return;
 380
 381         switch(initiator) {
 382         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 383                 ath_force_clear_no_ir_freq(wiphy, 2467);
 384                 ath_force_clear_no_ir_freq(wiphy, 2472);
 385                 break;
 386         case NL80211_REGDOM_SET_BY_USER:
 387                 if (!ath_reg_dyn_country_user_allow(reg))
 388                         break;
 389                 ath_force_clear_no_ir_freq(wiphy, 2467);
 390                 ath_force_clear_no_ir_freq(wiphy, 2472);
 391                 break;
 392         default:
 393                 ath_force_no_ir_freq(wiphy, 2467);
 394                 ath_force_no_ir_freq(wiphy, 2472);
 395         }
 396 }
 397
 398 /* Always apply Radar/DFS rules on freq range 5260 MHz - 5700 MHz */
 399 static void ath_reg_apply_radar_flags(struct wiphy *wiphy)
 400 {
 401         struct ieee80211_supported_band *sband;
 402         struct ieee80211_channel *ch;
 403         unsigned int i;
 404
 405         if (!wiphy->bands[IEEE80211_BAND_5GHZ])
 406                 return;
 407
 408         sband = wiphy->bands[IEEE80211_BAND_5GHZ];
 409
 410         for (i = 0; i < sband->n_channels; i++) {
 411                 ch = &sband->channels[i];
 412                 if (!ath_is_radar_freq(ch->center_freq))
 413                         continue;
 414                 /* We always enable radar detection/DFS on this
 415                  * frequency range. Additionally we also apply on
 416                  * this frequency range:
 417                  * - If STA mode does not yet have DFS supports disable
 418                  *   active scanning
 419                  * - If adhoc mode does not support DFS yet then
 420                  *   disable adhoc in the frequency.
 421                  * - If AP mode does not yet support radar detection/DFS
 422                  *   do not allow AP mode
 423                  */
 424                 if (!(ch->flags & IEEE80211_CHAN_DISABLED))
 425                         ch->flags |= IEEE80211_CHAN_RADAR |
 426                                      IEEE80211_CHAN_NO_IR;
 427         }
 428 }
 429
 430 static void ath_reg_apply_world_flags(struct wiphy *wiphy,
 431                                       enum nl80211_reg_initiator initiator,
 432                                       struct ath_regulatory *reg)
 433 {
 434         switch (reg->regpair->regDmnEnum) {
 435         case 0x60:
 436         case 0x63:
 437         case 0x66:
 438         case 0x67:
 439         case 0x6C:
 440                 ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
 441                 break;
 442         case 0x68:
 443                 ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
 444                 ath_reg_apply_ir_flags(wiphy, reg, initiator);
 445                 break;
 446         default:
 447                 if (ath_reg_dyn_country_user_allow(reg))
 448                         ath_reg_apply_beaconing_flags(wiphy, reg, initiator);
 449         }
 450 }
 451
 452 static u16 ath_regd_find_country_by_name(char *alpha2)
 453 {
 454         unsigned int i;
 455
 456         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 457                 if (!memcmp(allCountries[i].isoName, alpha2, 2))
 458                         return allCountries[i].countryCode;
 459         }
 460
 461         return -1;
 462 }
 463
 464 static int __ath_reg_dyn_country(struct wiphy *wiphy,
 465                                  struct ath_regulatory *reg,
 466                                  struct regulatory_request *request)
 467 {
 468         u16 country_code;
 469
 470         if (request->initiator == NL80211_REGDOM_SET_BY_COUNTRY_IE &&
 471             !ath_is_world_regd(reg))
 472                 return -EINVAL;
 473
 474         country_code = ath_regd_find_country_by_name(request->alpha2);
 475         if (country_code == (u16) -1)
 476                 return -EINVAL;
 477
 478         reg->current_rd = COUNTRY_ERD_FLAG;
 479         reg->current_rd |= country_code;
 480
 481         __ath_regd_init(reg);
 482
 483         ath_reg_apply_world_flags(wiphy, request->initiator, reg);
 484
 485         return 0;
 486 }
 487
 488 static void ath_reg_dyn_country(struct wiphy *wiphy,
 489                                 struct ath_regulatory *reg,
 490                                 struct regulatory_request *request)
 491 {
 492         if (__ath_reg_dyn_country(wiphy, reg, request))
 493                 return;
 494
 495         printk(KERN_DEBUG "ath: regdomain 0x%0x "
 496                           "dynamically updated by %s\n",
 497                reg->current_rd,
 498                reg_initiator_name(request->initiator));
 499 }
 500
 501 void ath_reg_notifier_apply(struct wiphy *wiphy,
 502                             struct regulatory_request *request,
 503                             struct ath_regulatory *reg)
 504 {
 505         struct ath_common *common = container_of(reg, struct ath_common,
 506                                                  regulatory);
 507         /* We always apply this */
 508         ath_reg_apply_radar_flags(wiphy);
 509
 510         /*
 511          * This would happen when we have sent a custom regulatory request
 512          * a world regulatory domain and the scheduler hasn't yet processed
 513          * any pending requests in the queue.
 514          */
 515         if (!request)
 516                 return;
 517
 518         switch (request->initiator) {
 519         case NL80211_REGDOM_SET_BY_CORE:
 520                 /*
 521                  * If common->reg_world_copy is world roaming it means we *were*
 522                  * world roaming... so we now have to restore that data.
 523                  */
 524                 if (!ath_is_world_regd(&common->reg_world_copy))
 525                         break;
 526
 527                 memcpy(reg, &common->reg_world_copy,
 528                        sizeof(struct ath_regulatory));
 529                 break;
 530         case NL80211_REGDOM_SET_BY_DRIVER:
 531                 break;
 532         case NL80211_REGDOM_SET_BY_USER:
 533                 if (ath_reg_dyn_country_user_allow(reg))
 534                         ath_reg_dyn_country(wiphy, reg, request);
 535                 break;
 536         case NL80211_REGDOM_SET_BY_COUNTRY_IE:
 537                 ath_reg_dyn_country(wiphy, reg, request);
 538                 break;
 539         }
 540 }
 541 EXPORT_SYMBOL(ath_reg_notifier_apply);
 542
 543 static bool ath_regd_is_eeprom_valid(struct ath_regulatory *reg)
 544 {
 545         u16 rd = ath_regd_get_eepromRD(reg);
 546         int i;
 547
 548         if (rd & COUNTRY_ERD_FLAG) {
 549                 /* EEPROM value is a country code */
 550                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 551                 printk(KERN_DEBUG
 552                        "ath: EEPROM indicates we should expect "
 553                         "a country code\n");
 554                 for (i = 0; i < ARRAY_SIZE(allCountries); i++)
 555                         if (allCountries[i].countryCode == cc)
 556                                 return true;
 557         } else {
 558                 /* EEPROM value is a regpair value */
 559                 if (rd != CTRY_DEFAULT)
 560                         printk(KERN_DEBUG "ath: EEPROM indicates we "
 561                                "should expect a direct regpair map\n");
 562                 for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++)
 563                         if (regDomainPairs[i].regDmnEnum == rd)
 564                                 return true;
 565         }
 566         printk(KERN_DEBUG
 567                  "ath: invalid regulatory domain/country code 0x%x\n", rd);
 568         return false;
 569 }
 570
 571 /* EEPROM country code to regpair mapping */
 572 static struct country_code_to_enum_rd*
 573 ath_regd_find_country(u16 countryCode)
 574 {
 575         int i;
 576
 577         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 578                 if (allCountries[i].countryCode == countryCode)
 579                         return &allCountries[i];
 580         }
 581         return NULL;
 582 }
 583
 584 /* EEPROM rd code to regpair mapping */
 585 static struct country_code_to_enum_rd*
 586 ath_regd_find_country_by_rd(int regdmn)
 587 {
 588         int i;
 589
 590         for (i = 0; i < ARRAY_SIZE(allCountries); i++) {
 591                 if (allCountries[i].regDmnEnum == regdmn)
 592                         return &allCountries[i];
 593         }
 594         return NULL;
 595 }
 596
 597 /* Returns the map of the EEPROM set RD to a country code */
 598 static u16 ath_regd_get_default_country(u16 rd)
 599 {
 600         if (rd & COUNTRY_ERD_FLAG) {
 601                 struct country_code_to_enum_rd *country = NULL;
 602                 u16 cc = rd & ~COUNTRY_ERD_FLAG;
 603
 604                 country = ath_regd_find_country(cc);
 605                 if (country != NULL)
 606                         return cc;
 607         }
 608
 609         return CTRY_DEFAULT;
 610 }
 611
 612 static struct reg_dmn_pair_mapping*
 613 ath_get_regpair(int regdmn)
 614 {
 615         int i;
 616
 617         if (regdmn == NO_ENUMRD)
 618                 return NULL;
 619         for (i = 0; i < ARRAY_SIZE(regDomainPairs); i++) {
 620                 if (regDomainPairs[i].regDmnEnum == regdmn)
 621                         return &regDomainPairs[i];
 622         }
 623         return NULL;
 624 }
 625
 626 static int
 627 ath_regd_init_wiphy(struct ath_regulatory *reg,
 628                     struct wiphy *wiphy,
 629                     void (*reg_notifier)(struct wiphy *wiphy,
 630                                          struct regulatory_request *request))
 631 {
 632         const struct ieee80211_regdomain *regd;
 633
 634         wiphy->reg_notifier = reg_notifier;
 635         wiphy->regulatory_flags |= REGULATORY_STRICT_REG |
 636                                    REGULATORY_CUSTOM_REG;
 637
 638         if (ath_is_world_regd(reg)) {
 639                 /*
 640                  * Anything applied here (prior to wiphy registration) gets
 641                  * saved on the wiphy orig_* parameters
 642                  */
 643                 regd = ath_world_regdomain(reg);
 644                 wiphy->regulatory_flags |= REGULATORY_COUNTRY_IE_FOLLOW_POWER;
 645         } else {
 646                 /*
 647                  * This gets applied in the case of the absence of CRDA,
 648                  * it's our own custom world regulatory domain, similar to
 649                  * cfg80211's but we enable passive scanning.
 650                  */
 651                 regd = ath_default_world_regdomain();
 652         }
 653
 654         wiphy_apply_custom_regulatory(wiphy, regd);
 655         ath_reg_apply_radar_flags(wiphy);
 656         ath_reg_apply_world_flags(wiphy, NL80211_REGDOM_SET_BY_DRIVER, reg);
 657         return 0;
 658 }
 659
 660 /*
 661  * Some users have reported their EEPROM programmed with
 662  * 0x8000 set, this is not a supported regulatory domain
 663  * but since we have more than one user with it we need
 664  * a solution for them. We default to 0x64, which is the
 665  * default Atheros world regulatory domain.
 666  */
 667 static void ath_regd_sanitize(struct ath_regulatory *reg)
 668 {
 669         if (reg->current_rd != COUNTRY_ERD_FLAG)
 670                 return;
 671         printk(KERN_DEBUG "ath: EEPROM regdomain sanitized\n");
 672         reg->current_rd = 0x64;
 673 }
 674
 675 static int __ath_regd_init(struct ath_regulatory *reg)
 676 {
 677         struct country_code_to_enum_rd *country = NULL;
 678         u16 regdmn;
 679
 680         if (!reg)
 681                 return -EINVAL;
 682
 683         ath_regd_sanitize(reg);
 684
 685         printk(KERN_DEBUG "ath: EEPROM regdomain: 0x%0x\n", reg->current_rd);
 686
 687         if (!ath_regd_is_eeprom_valid(reg)) {
 688                 pr_err("Invalid EEPROM contents\n");
 689                 return -EINVAL;
 690         }
 691
 692         regdmn = ath_regd_get_eepromRD(reg);
 693         reg->country_code = ath_regd_get_default_country(regdmn);
 694
 695         if (reg->country_code == CTRY_DEFAULT &&
 696             regdmn == CTRY_DEFAULT) {
 697                 printk(KERN_DEBUG "ath: EEPROM indicates default "
 698                        "country code should be used\n");
 699                 reg->country_code = CTRY_UNITED_STATES;
 700         }
 701
 702         if (reg->country_code == CTRY_DEFAULT) {
 703                 country = NULL;
 704         } else {
 705                 printk(KERN_DEBUG "ath: doing EEPROM country->regdmn "
 706                        "map search\n");
 707                 country = ath_regd_find_country(reg->country_code);
 708                 if (country == NULL) {
 709                         printk(KERN_DEBUG
 710                                 "ath: no valid country maps found for "
 711                                 "country code: 0x%0x\n",
 712                                 reg->country_code);
 713                         return -EINVAL;
 714                 } else {
 715                         regdmn = country->regDmnEnum;
 716                         printk(KERN_DEBUG "ath: country maps to "
 717                                "regdmn code: 0x%0x\n",
 718                                regdmn);
 719                 }
 720         }
 721
 722         reg->regpair = ath_get_regpair(regdmn);
 723
 724         if (!reg->regpair) {
 725                 printk(KERN_DEBUG "ath: "
 726                         "No regulatory domain pair found, cannot continue\n");
 727                 return -EINVAL;
 728         }
 729
 730         if (!country)
 731                 country = ath_regd_find_country_by_rd(regdmn);
 732
 733         if (country) {
 734                 reg->alpha2[0] = country->isoName[0];
 735                 reg->alpha2[1] = country->isoName[1];
 736         } else {
 737                 reg->alpha2[0] = '0';
 738                 reg->alpha2[1] = '0';
 739         }
 740
 741         printk(KERN_DEBUG "ath: Country alpha2 being used: %c%c\n",
 742                 reg->alpha2[0], reg->alpha2[1]);
 743         printk(KERN_DEBUG "ath: Regpair used: 0x%0x\n",
 744                 reg->regpair->regDmnEnum);
 745
 746         return 0;
 747 }
 748
 749 int
 750 ath_regd_init(struct ath_regulatory *reg,
 751               struct wiphy *wiphy,
 752               void (*reg_notifier)(struct wiphy *wiphy,
 753                                    struct regulatory_request *request))
 754 {
 755         struct ath_common *common = container_of(reg, struct ath_common,
 756                                                  regulatory);
 757         int r;
 758
 759         r = __ath_regd_init(reg);
 760         if (r)
 761                 return r;
 762
 763         if (ath_is_world_regd(reg))
 764                 memcpy(&common->reg_world_copy, reg,
 765                        sizeof(struct ath_regulatory));
 766
 767         ath_regd_init_wiphy(reg, wiphy, reg_notifier);
 768
 769         return 0;
 770 }
 771 EXPORT_SYMBOL(ath_regd_init);
 772
 773 u32 ath_regd_get_band_ctl(struct ath_regulatory *reg,
 774                           enum ieee80211_band band)
 775 {
 776         if (!reg->regpair ||
 777             (reg->country_code == CTRY_DEFAULT &&
 778              is_wwr_sku(ath_regd_get_eepromRD(reg)))) {
 779                 return SD_NO_CTL;
 780         }
 781
 782         switch (band) {
 783         case IEEE80211_BAND_2GHZ:
 784                 return reg->regpair->reg_2ghz_ctl;
 785         case IEEE80211_BAND_5GHZ:
 786                 return reg->regpair->reg_5ghz_ctl;
 787         default:
 788                 return NO_CTL;
 789         }
 790 }
 791 EXPORT_SYMBOL(ath_regd_get_band_ctl);